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5V 1-Channel Single Relay Module for Arduino High Level Trigger (Works with Official Arduino Board)
A small current signal control equipment commonly used for controlling high power electronic modules through SMC; Widely used in the SMC system to make smart home projects; Features: Single channel; 4 M2 screws positioning holes for easy installation; High drive (5V or 3.3V) normally open contact closure; NPN transistor drive current; Onboard power indicator (green)£¬ relay indicator (red)